An Apatosaurus, also known as Brontosaurus, stands on display at the University of Wyoming Geological Museum. The Apatosaurus is a genus of sauropod dinosaur that lived from about 154 to 150 million years ago, during the Jurassic Period. It was one of the largest land animals known to have ever existed, with an average length of 75 ft and a mass of at least 16 metric tons. (U.S. Air Force photo by Matt Bilden)
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